Improvement in safety-gates for draw-bridges



immmm. SAFETY-GATES'IFOR'DRAW-BRIDGES. No. 186,971

Patented- Feb. 6, 1877..

' INVENTOR l IIIIIIIIIII IIIIIIII iu/eszes ATTORN EYS N. PETERS,NOTCkLITHOGRAFHER. WASHINGTON. DV 6.

- gates are open.

UNITED STATE DANIEL ARNDT, OF CLEVELAND, OHIO. I

IMPROVEMENT IN SAFETY-GATES FOR DRAVW-BRIDGIES.

Specification forming part of Letters Patent No. 186,971, dated February6,1877; application filed December 30, 1876- To all whom it may concern:

Be it known that I, DANIEL ARNDT, of Cleveland, in the county ofUuyahoga and State of Ohio, have invented certain new and usefulImprovements in Safety- Gates for Draw-Bridges; and I do hereby declarethe following to be a full, clear, and exact descrip tion of theinvention, such as will enable others skilled in the art to which itpertains to make and use it, reference being had to the accompanyingdrawing, which forms part of this specification.

My invention relates to safety-gates for draw-bridges.

In the drawing, Figurel represents an isometric view of a draw-bridgeand gate embodying my invention. Fig. 2 is an end view, as seen from thebridge when the gates are closed. Fig. 3 is a similar view when the Fig.4 is a view in side elevation with gates open, showing cam projection onunder side of bridge.

My invention consists in the parts and combinations as hereinafterspecified and claimed, wherein A represents a draw-bridge pivotedcentrally, and B B the bridge piers or abutments. They may be of anykind or construction, as my device is applicable to all kinds. 0 is apeculiarly -shaped cambar, pivoted on both sides of the bridge-pier ata. It may be constructed of one piece or of three piecestwo side piecesand a front piece, firmly secured to each other. These cam-bars arebent, as shown in the drawing, so as to secure a gradual opening andclosing of the bridge-gates, and so as to close them before the bridgeis entirely .open. The

pivot at a may be a bar or rod passing entirely through the pier, asshown in the drawing, thus serving for both ends of the cam-rod O, orsaid ends may be pivoted in any other suitable manner. D are the gates,which may be of any shape, construction, or material. They are pivotedat d to the bridge-posts, and are provided with the projecting pieces f.G is a connecting bar or link, which is attached at its upper end to thegate projection f, and at its lower end to cam-bar U, as shown at h. Nis a cam projection, fixed at the under side of the bridge at each endof the same, which acts on the cam-rod O, to open and close the gates.This cam projection may be of any form or shape, and may be provided,and preferably so, with anti-friction rollers, so as to facilitate theaction of the parts.

The operation of the device is as follows: When the gate is closed, asshown in Fig. 4, the cam projection N is in a position under the centralpart of the cam-bar O. In this position the connecting-link G is in itslowest position, and the gate is consequently open. If, now, the bridgeis turned on its pivot to open, the cam projection N moves to one side,and gradually allows the cam-bar O to drop, which it does by reason ofthe weighted gates, and which are gradually closed as the cam-bar islowered. The gates begin to close as the bridge opens, and. are entirelyclosed before the bridge is entirely open. If, now, the bridge isclosed, the cam projection N strikes the under side of the cam-bar whenthe bridge is nearly half closed, and gradually elevates the same, whichcauses the outer ends of said cam-bars to be lowered, whereby, by meansof the connectiuglinks G, the gates are opened.

I do not limitmyselt' in any manner to the connection between thecam-bar and the gate,

as any suitable connection between the two may be used and still becomprehended by my invention; nor do I limit the operation of my deviceto the opening of the gates by therising motion of the cam-bar, as sucha connection might easily be had between such bar and the gates that areverse operation would resu1tto wit, the opening of the gates by thedepression of the cam barand this construction would not only be in somecases adaptable to bridges, but might be utilized in automaticroad-gates.

At P, in Fig. 4, a stop might be placed, so that the cam-bar, when thebridge is closed, should not come in contact with the same, and in thismanner all jarring of the gates would be avoided. The several partswould in this case have to be so arranged as to depress the cam-bar whenthe bridge was being opened.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In combination with an automatic drawbridge gate, the pivoted cam-barG, substantially as and for the purpose described.

2. In an automatic draw-bridge gate, the

combination of a pivoted cam-bar, connecting- In testimony whereof Ihavesigned my name link, and gate, substantially as and for the to thisspecification in the presence of two purpose described. subscribingwitnesses.

3.'In combination with a pivoted cam-bar, DANIEL ARNDT. connecting-link,and gate, a cam projection on Witnesses: the under side of the bridge,substantially as FRANCIS TOUMEY, and for the purpose described. WM.BEHBENS.

